System and method for obtaining radiation characteristics of built-in antenna in mobile communication terminal

Abstract

A mobile terminal has an electromagnetic interference (EMI) shielding region set at an upper side of a main body part where an internal antenna is mounted. The internal antenna may be mounted on a main printed circuit board (PCB) in order to obtain a desired radiation gain. Such a shielding region alleviates the need to use metallic shielding material or EMI spraying throughout many parts of the terminal. In addition, in order to maximize wireless characteristics of the built-in antenna, a PCB ground is removed from a folder part and a FPCB connector is moved to a position along a side of a terminal display. With this structure, degradation of radiation characteristics of the antenna due to metal components installed around the built-in antenna can be prevented, and thus a stable radiation gain of the terminal antenna can be obtained.

1. A method of optimizing a radiation gain for a mobile terminal comprising a terminal body having a first region and a second region that lies outside of the first region, and an internal antenna, the method comprising:
 mounting the internal antenna within the terminal body; and 
 providing an electromagnetic interference (EMI) shielding region in the first region, wherein the internal antenna is arranged within the first region and wherein the shielding region is aligned and substantially coextensive in size with the internal antenna and wherein the shielding region enhances a radiation gain of the internal antenna, wherein: 
 the mobile terminal includes a folding part coupled to the terminal body by a hinge, and 
 the shielding region that is aligned and coextensive in size with the internal antenna includes the hinge, internal antenna, an aligned portion of the terminal body, and an aligned portion of the folder part, said aligned portions of the terminal body and folding part also substantially coextensive with the size of the internal antenna, wherein the internal antenna lies entirely within the shielding region irrespective of whether the folding part is in an open or closed state relative to the terminal body. 
 
   
   
     2. The method of  claim 1 , wherein the shielding region includes a first EMI excluding portion on the terminal body at a location which coincides with the internal antenna. 
   
   
     3. The method of  claim 2 , wherein the shielding region includes a second EMI excluding portion on the folding part at a location which coincides with the internal antenna. 
   
   
     4. The method of  claim 3 , wherein a portion of the folding part of the terminal in the shielding region does not have metallic material and EMI shielding material. 
   
   
     5. The method of  claim 4 , wherein the portion of the terminal folding part in the shielding region excludes the metallic material and EMI shielding material when the terminal is in both a closed and open state. 
   
   
     6. The method of  claim 4 , further comprising:
 positioning a flexible printed circuit board (FPCB) connector to a side portion of a display of the terminal, so that the connector is not in the shielding region when the mobile terminal is in open and closed positions. 
 
   
   
     7. The method of  claim 1 , wherein the shielding region shields the internal antenna to produce substantially same radiation characteristics in both open and closed positions of the folder part. 
   
   
     8. The method of  claim 1 , wherein a printed circuit board is included in the folding part, said printed circuit board maintaining a predetermined distance from the internal antenna when the folding part is in both opened and closed positions. 
   
   
     9. The method of  claim 8 , wherein said predetermined distance is maintained by providing a ground terminal at a location different from the printed circuit board in the folding part. 
   
   
     10. A mobile communication terminal, comprising:
 a terminal body having a first region and a second region that lies outside of the first region; 
 an internal antenna mounted in the terminal body; 
 an electromagnetic interference (EMI) shielding region in the first region, and 
 a folding part coupled to the terminal body by a hinge, 
 wherein the internal antenna is arranged within the first region, 
 wherein the shielding region is aligned and substantially coextensive in size with the internal antenna, 
 wherein the internal antenna is arranged entirely within the shielding region, and wherein the shielding region enhances a radiation gain of the internal antenna, 
 wherein the shielding region that is aligned and coextensive in size with the internal antenna includes the hinge, internal antenna, an aligned portion of the terminal body, and an aligned portion of the folder part, said aligned portions of the terminal body and folder part also substantially coextensive with the size of the internal antenna, and 
 wherein the internal antenna lies entirely within the shielding region irrespective of whether the folding part is in an open or closed state relative to the terminal body. 
 
   
   
     11. The terminal of  claim 10 , wherein the shielding region includes: an EMI excluding portion formed at an area proximate a housing of the terminal at a location which coincides with the internal antenna. 
   
   
     12. The terminal of  claim 10 , wherein the shielding region allows the internal antenna to achieve a desired radiation gain, said gain being achieved without including metallic EMI shielding material on a region of a terminal body that lies within the shielding region. 
   
   
     13. The terminal of  claim 12 , wherein the EMI shielding material includes EMI sprayed material formed on a region of the terminal body that lies within the shielding region. 
   
   
     14. The terminal of  claim 10 , wherein a range of the shielding region is based on a size of the internal antenna. 
   
   
     15. The terminal of  claim 10 , wherein the internal antenna is coupled in a circuit board of the terminal. 
   
   
     16. The terminal of  claim 10 , wherein a PCB ground is removed from one of the first region or the second region where the internal antenna is arranged within said one of the first region or the second region. 
   
   
     17. The terminal of  claim 10 , wherein the second region includes a keyboard of the mobile terminal. 
   
   
     18. The terminal of  claim 10 , wherein the shielding region does not overlap a keyboard or a screen of the mobile terminal. 
   
   
     19. A mobile communication terminal, comprising:
 a first body having a first region and a second region that lies outside of the first region; 
 a second body connected to the first body by a hinge, the second body having a first portion and a second portion, wherein the first portion and the second portion correspond to the first region and the second region of the first body respectively when the second body is closed; 
 an internal antenna mounted in the first body; and 
 an EMI shielding region included in the first region, wherein the internal antenna is arranged within the first region, and wherein the EMI shielding region further includes the hinge, the first region of the first body, the portion of the second body that corresponds to the first region of the first body, and the internal antenna, wherein the shielding region is aligned and substantially coextensive in size with the internal antenna, wherein the internal antenna lies entirely within the shielding region, and wherein the shielding region enhances a radiation gain of the internal antenna. 
 
   
   
     20. The terminal of  claim 19 , wherein the shielding region includes:
 a first EMI excluding portion on the first body at a location which coincides with the internal antenna; and 
 a second EMI excluding portion on the second body at a location which coincides with the internal antenna. 
 
   
   
     21. The terminal of  claim 19 , wherein the shielding region encompasses a portion of the first body adjacent to the internal antenna. 
   
   
     22. The terminal of  claim 19 , wherein the internal antenna is located where the first body is hinged to the second body. 
   
   
     23. The terminal of  claim 19 , wherein the shielding region does not include metallic material and EMI shielding material. 
   
   
     24. The terminal of  claim 19 , wherein the shielding region includes portions of a front housing, a rear housing, and a portion of a circuit board of the first body. 
   
   
     25. The terminal of  claim 24 , wherein a PGB ground is removed from one of the first region or the second region where the internal antenna is arranged within said one of the first region or the second region. 
   
   
     26. The terminal of  claim 19 , wherein a range of the shielding region is based on a size of the internal antenna. 
   
   
     27. The terminal of  claim 19 , further comprising:
 a display, and 
 a flexible printed circuit board (FPCB) connector located at a side portion of the display, so that the connector is not in the shielding region when the second body is in open and closed positions.